\documentclass[a5paper]{article} 
\usepackage[pdftex]{color,graphicx,epsfig}
\usepackage[left=2cm,top=2.cm,bottom=2.cm,right=2cm]{geometry}
\usepackage[final]{pdfpages}
\begin{document} 
\includepdf[pages=-, signature=40,landscape, frame=true]{Booklet2x1.pdf}
\end{document} 
